Everything too much about blokes: share in growing concern (9)
I believe the answer is:
allotment
'share in growing concern' is the definition.
(share of land for growing food)
'everything too much about blokes' is the wordplay.
'everything' becomes 'all' (all things).
'too much' becomes 'OTT' (short for over the top).
'about' indicates putting letters inside.
'blokes' becomes 'men' (bloke can informally mean a man).
'ott' going around 'men' is 'otment'.
'all'+'otment'='ALLOTMENT'
(Other definitions for allotment that I've seen before include "grant?" , "allocation" , "growing area?" , "Allowance" , "patch" .)